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Something like that is now possible as follows.

var('x,y,z')
cm = colormaps.winter
f = sin(2*z).function(x,y,z)
implicit_plot3d(x^2-y^2*z == 0,(x,-4,4),(y,-4,4),(z,-4,4), color=(f,cm))

where cm is a chosen colormap among those available. Beware that the coloring function f must takes values between 0 and 1.